//// Copyright (C) 2004-2023 Artifex Software, Inc.
////
//// This file is part of MuPDF.
////
//// MuPDF is free software: you can redistribute it and/or modify it under the
//// terms of the GNU Affero General Public License as published by the Free
//// Software Foundation, either version 3 of the License, or (at your option)
//// any later version.
////
//// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
//// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
//// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
//// details.
////
//// You should have received a copy of the GNU Affero General Public License
//// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
////
//// Alternative licensing terms are available from the licensor.
//// For commercial licensing, see <https://www.artifex.com/> or contact
//// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
//// CA 94129, USA, for further information.
//
//#include "mupdf/fitz.h"
//
///*
// * Write pixmap to PNM file (without alpha channel)
// */
//static void
//pnm_write_header(fz_context *ctx, fz_band_writer *writer, fz_colorspace *cs)
//{
//	fz_output *out = writer->out;
//	int w = writer->w;
//	int h = writer->h;
//	int n = writer->n;
//	int alpha = writer->alpha;
//
//	if (writer->s != 0)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "PNM writer cannot cope with spot colors");
//	if (cs && !fz_colorspace_is_gray(ctx, cs) && !fz_colorspace_is_rgb(ctx, cs))
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "pixmap must be grayscale or rgb to write as pnm");
//
//	/* Treat alpha only as greyscale */
//	if (n == 1 && alpha)
//		alpha = 0;
//	n -= alpha;
//
//	if (alpha)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "PNM writer cannot cope with alpha");
//
//	if (n == 1)
//		fz_write_printf(ctx, out, "P5\n");
//	if (n == 3)
//		fz_write_printf(ctx, out, "P6\n");
//	fz_write_printf(ctx, out, "%d %d\n", w, h);
//	fz_write_printf(ctx, out, "255\n");
//}
//
//static void
//pnm_write_band(fz_context *ctx, fz_band_writer *writer, int stride, int band_start, int band_height, const unsigned char *p)
//{
//	fz_output *out = writer->out;
//	int w = writer->w;
//	int h = writer->h;
//	int n = writer->n;
//	int len;
//	int end = band_start + band_height;
//
//	if (n != 1 && n != 3)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "pixmap must be grayscale or rgb to write as pnm");
//
//	if (!out)
//		return;
//
//	if (end > h)
//		end = h;
//	end -= band_start;
//
//	/* Tests show that writing single bytes out at a time
//	 * is appallingly slow. We get a huge improvement
//	 * by collating stuff into buffers first. */
//
//	while (end--)
//	{
//		len = w;
//		while (len)
//		{
//			int num_written = len;
//
//			switch (n)
//			{
//			case 1:
//				/* No collation required */
//				fz_write_data(ctx, out, p, num_written);
//				p += num_written;
//				break;
//			case 3:
//				fz_write_data(ctx, out, p, num_written*3);
//				p += num_written*3;
//				break;
//			}
//			len -= num_written;
//		}
//		p += stride - w*n;
//	}
//}
//
//fz_band_writer *fz_new_pnm_band_writer(fz_context *ctx, fz_output *out)
//{
//	fz_band_writer *writer = fz_new_band_writer(ctx, fz_band_writer, out);
//
//	writer->header = pnm_write_header;
//	writer->band = pnm_write_band;
//
//	return writer;
//}
//
//void
//fz_write_pixmap_as_pnm(fz_context *ctx, fz_output *out, fz_pixmap *pixmap)
//{
//	fz_band_writer *writer = fz_new_pnm_band_writer(ctx, out);
//	fz_try(ctx)
//	{
//		fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 0, pixmap->colorspace, pixmap->seps);
//		fz_write_band(ctx, writer, pixmap->stride, pixmap->h, pixmap->samples);
//		fz_close_band_writer(ctx, writer);
//	}
//	fz_always(ctx)
//		fz_drop_band_writer(ctx, writer);
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//}
//
//void
//fz_save_pixmap_as_pnm(fz_context *ctx, fz_pixmap *pixmap, const char *filename)
//{
//	fz_band_writer *writer = NULL;
//	fz_output *out = fz_new_output_with_path(ctx, filename, 0);
//
//	fz_var(writer);
//
//	fz_try(ctx)
//	{
//		writer = fz_new_pnm_band_writer(ctx, out);
//		fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 0, pixmap->colorspace, pixmap->seps);
//		fz_write_band(ctx, writer, pixmap->stride, pixmap->h, pixmap->samples);
//		fz_close_band_writer(ctx, writer);
//		fz_close_output(ctx, out);
//	}
//	fz_always(ctx)
//	{
//		fz_drop_band_writer(ctx, writer);
//		fz_drop_output(ctx, out);
//	}
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//}
//
///*
// * Write pixmap to PAM file (with or without alpha channel)
// */
//
//static void
//pam_write_header(fz_context *ctx, fz_band_writer *writer, fz_colorspace *cs)
//{
//	fz_output *out = writer->out;
//	int w = writer->w;
//	int h = writer->h;
//	int n = writer->n;
//	int alpha = writer->alpha;
//
//	if (writer->s != 0)
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "PAM writer cannot cope with spot colors");
//
//	fz_write_printf(ctx, out, "P7\n");
//	fz_write_printf(ctx, out, "WIDTH %d\n", w);
//	fz_write_printf(ctx, out, "HEIGHT %d\n", h);
//	fz_write_printf(ctx, out, "DEPTH %d\n", n);
//	fz_write_printf(ctx, out, "MAXVAL 255\n");
//
//	n -= alpha;
//
//	if (n == 0 && alpha) fz_write_printf(ctx, out, "TUPLTYPE GRAYSCALE\n");
//	else if (n == 1 && !alpha && fz_colorspace_is_gray(ctx, cs)) fz_write_printf(ctx, out, "TUPLTYPE GRAYSCALE\n");
//	else if (n == 1 && alpha && fz_colorspace_is_gray(ctx, cs)) fz_write_printf(ctx, out, "TUPLTYPE GRAYSCALE_ALPHA\n");
//	else if (n == 3 && !alpha && fz_colorspace_is_rgb(ctx, cs)) fz_write_printf(ctx, out, "TUPLTYPE RGB\n");
//	else if (n == 3 && alpha && fz_colorspace_is_rgb(ctx, cs)) fz_write_printf(ctx, out, "TUPLTYPE RGB_ALPHA\n");
//	else if (n == 4 && !alpha && fz_colorspace_is_cmyk(ctx, cs)) fz_write_printf(ctx, out, "TUPLTYPE CMYK\n");
//	else if (n == 4 && alpha && fz_colorspace_is_cmyk(ctx, cs)) fz_write_printf(ctx, out, "TUPLTYPE CMYK_ALPHA\n");
//	else
//		fz_throw(ctx, FZ_ERROR_ARGUMENT, "pixmap must be alpha only, gray, rgb, or cmyk");
//	fz_write_printf(ctx, out, "ENDHDR\n");
//}
//
//static void
//pam_write_band(fz_context *ctx, fz_band_writer *writer, int stride, int band_start, int band_height, const unsigned char *sp)
//{
//	fz_output *out = writer->out;
//	int w = writer->w;
//	int h = writer->h;
//	int n = writer->n;
//	int alpha = writer->alpha;
//	int x, y;
//	int end = band_start + band_height;
//
//	if (!out)
//		return;
//
//	if (end > h)
//		end = h;
//	end -= band_start;
//
//	if (alpha)
//	{
//		/* Buffer must be a multiple of 2, 3 and 5 at least. */
//		/* Also, for the generic case, it must be bigger than FZ_MAX_COLORS */
//		char buffer[2*3*4*5*6];
//		char *b = buffer;
//		stride -= n * w;
//		switch (n)
//		{
//		case 2:
//			for (y = 0; y < end; y++)
//			{
//				for (x = 0; x < w; x++)
//				{
//					int a = sp[1];
//					*b++ = a ? (sp[0] * 255 + (a>>1))/a : 0;
//					*b++ = a;
//					sp += 2;
//					if (b == &buffer[sizeof(buffer)])
//					{
//						fz_write_data(ctx, out, buffer, sizeof(buffer));
//						b = buffer;
//					}
//				}
//				sp += stride;
//			}
//			if (b != buffer)
//				fz_write_data(ctx, out, buffer, b - buffer);
//			break;
//		case 4:
//			for (y = 0; y < end; y++)
//			{
//				for (x = 0; x < w; x++)
//				{
//					int a = sp[3];
//					int inva = a ? 256 * 255 / a : 0;
//					*b++ = (sp[0] * inva + 128)>>8;
//					*b++ = (sp[1] * inva + 128)>>8;
//					*b++ = (sp[2] * inva + 128)>>8;
//					*b++ = a;
//					sp += 4;
//					if (b == &buffer[sizeof(buffer)])
//					{
//						fz_write_data(ctx, out, buffer, sizeof(buffer));
//						b = buffer;
//					}
//				}
//				sp += stride;
//			}
//			if (b != buffer)
//				fz_write_data(ctx, out, buffer, b - buffer);
//			break;
//		case 5:
//			for (y = 0; y < end; y++)
//			{
//				for (x = 0; x < w; x++)
//				{
//					int a = sp[4];
//					int inva = a ? 256 * 255 / a : 0;
//					*b++ = (sp[0] * inva + 128)>>8;
//					*b++ = (sp[1] * inva + 128)>>8;
//					*b++ = (sp[2] * inva + 128)>>8;
//					*b++ = (sp[3] * inva + 128)>>8;
//					*b++ = a;
//					sp += 5;
//					if (b == &buffer[sizeof(buffer)])
//					{
//						fz_write_data(ctx, out, buffer, sizeof(buffer));
//						b = buffer;
//					}
//				}
//				sp += stride;
//			}
//			if (b != buffer)
//				fz_write_data(ctx, out, buffer, b - buffer);
//			break;
//		default:
//			for (y = 0; y < end; y++)
//			{
//				for (x = 0; x < w; x++)
//				{
//					int a = sp[n-1];
//					int inva = a ? 256 * 255 / a : 0;
//					int k;
//					for (k = 0; k < n-1; k++)
//						*b++ = (*sp++ * inva + 128)>>8;
//					*b++ = a;
//					sp++;
//					if (b >= &buffer[sizeof(buffer)] - n)
//					{
//						fz_write_data(ctx, out, buffer, b - buffer);
//						b = buffer;
//					}
//				}
//				sp += stride;
//			}
//			if (b != buffer)
//				fz_write_data(ctx, out, buffer, b - buffer);
//			break;
//		}
//	}
//	else
//		for (y = 0; y < end; y++)
//		{
//			fz_write_data(ctx, out, sp, (size_t)w * n);
//			sp += stride;
//		}
//}
//
//fz_band_writer *fz_new_pam_band_writer(fz_context *ctx, fz_output *out)
//{
//	fz_band_writer *writer = fz_new_band_writer(ctx, fz_band_writer, out);
//
//	writer->header = pam_write_header;
//	writer->band = pam_write_band;
//
//	return writer;
//}
//
//void
//fz_write_pixmap_as_pam(fz_context *ctx, fz_output *out, fz_pixmap *pixmap)
//{
//	fz_band_writer *writer = fz_new_pam_band_writer(ctx, out);
//	fz_try(ctx)
//	{
//		fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 0, pixmap->colorspace, pixmap->seps);
//		fz_write_band(ctx, writer, pixmap->stride, pixmap->h, pixmap->samples);
//		fz_close_band_writer(ctx, writer);
//	}
//	fz_always(ctx)
//		fz_drop_band_writer(ctx, writer);
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//}
//
//void
//fz_save_pixmap_as_pam(fz_context *ctx, fz_pixmap *pixmap, const char *filename)
//{
//	fz_band_writer *writer = NULL;
//	fz_output *out = fz_new_output_with_path(ctx, filename, 0);
//
//	fz_var(writer);
//
//	fz_try(ctx)
//	{
//		writer = fz_new_pam_band_writer(ctx, out);
//		fz_write_header(ctx, writer, pixmap->w, pixmap->h, pixmap->n, pixmap->alpha, 0, 0, 0, pixmap->colorspace, pixmap->seps);
//		fz_write_band(ctx, writer, pixmap->stride, pixmap->h, pixmap->samples);
//		fz_close_band_writer(ctx, writer);
//		fz_close_output(ctx, out);
//	}
//	fz_always(ctx)
//	{
//		fz_drop_band_writer(ctx, writer);
//		fz_drop_output(ctx, out);
//	}
//	fz_catch(ctx)
//		fz_rethrow(ctx);
//}
//
//static fz_buffer *
//buffer_from_pixmap(fz_context *ctx, fz_pixmap *pix, fz_color_params color_params, int drop,
//	void (*do_write)(fz_context *ctx, fz_output *out, fz_pixmap *pix))
//{
//	fz_buffer *buf = NULL;
//	fz_output *out = NULL;
//
//	fz_var(buf);
//	fz_var(out);
//
//	fz_try(ctx)
//	{
//		buf = fz_new_buffer(ctx, 1024);
//		out = fz_new_output_with_buffer(ctx, buf);
//		do_write(ctx, out, pix);
//		fz_close_output(ctx, out);
//	}
//	fz_always(ctx)
//	{
//		if (drop)
//			fz_drop_pixmap(ctx, pix);
//		fz_drop_output(ctx, out);
//	}
//	fz_catch(ctx)
//	{
//		fz_drop_buffer(ctx, buf);
//		fz_rethrow(ctx);
//	}
//	return buf;
//}
//
//fz_buffer *
//fz_new_buffer_from_image_as_pnm(fz_context *ctx, fz_image *image, fz_color_params color_params)
//{
//	fz_pixmap *pix = fz_get_pixmap_from_image(ctx, image, NULL, NULL, NULL, NULL);
//	return buffer_from_pixmap(ctx, pix, color_params, 1, fz_write_pixmap_as_pnm);
//}
//
//fz_buffer *
//fz_new_buffer_from_pixmap_as_pnm(fz_context *ctx, fz_pixmap *pix, fz_color_params color_params)
//{
//	return buffer_from_pixmap(ctx, pix, color_params, 0, fz_write_pixmap_as_pnm);
//}
//
//fz_buffer *
//fz_new_buffer_from_image_as_pam(fz_context *ctx, fz_image *image, fz_color_params color_params)
//{
//	fz_pixmap *pix = fz_get_pixmap_from_image(ctx, image, NULL, NULL, NULL, NULL);
//	return buffer_from_pixmap(ctx, pix, color_params, 1, fz_write_pixmap_as_pam);
//}
//
//fz_buffer *
//fz_new_buffer_from_pixmap_as_pam(fz_context *ctx, fz_pixmap *pix, fz_color_params color_params)
//{
//	return buffer_from_pixmap(ctx, pix, color_params, 0, fz_write_pixmap_as_pam);
//}
